Quan Jinbei wasn't surprised to receive an invitation from Quan Chengyi.
However...
He was surprised that Quan Chengyi would lower himself to the extent of earnestly begging him to make sure he attended.
Those who knew him were aware that anyone who could even hold a banquet at his level would send him an invitation.
Whether he would attend was another matter, but the attitude had to be correct.
This rule applied no matter the circumstance.
Quan Chengyi couldn't possibly be unaware of it.
His insistence on personally inviting Jinbei meant there had to be a reason.
Facing Jinbei's puzzled look, Quan Chengyi could only explain that his daughter hoped he would attend to express her gratitude, "Jinbei, your uncle knows he's been troubling you a lot lately, but Feifei just came home, and it's rare for her to have a wish. Please, for your uncle's sake, you must come!"